Affiliation: | (1) Gillings School of Global Public Health, Department of Health Behavior and Health Education, CB#7440, University of North Carolina at Chapel Hill, Chapel Hill, NC 29975-7440, USA;(2) L.L. Thurstone Psychometric Laboratory, Department of Psychology, CB#3270, University of North Carolina at Chapel Hill, Chapel Hill, NC 29975-3270, USA;(3) Department of Health Behavior and Health Education, CB #7440, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC 27599-7440, USA |